Operation Ivy, Nuclear tests site in Enewetak Atoll, Marshall Islands.
Operation Ivy refers to two atomic weapons tests carried out in November 1952 on Enewetak Atoll, resulting in the first successful detonation of a thermonuclear weapon. The tests took place on two different islands within the atoll, with the first test completely destroying Elugelab Island and the second conducted on Runit Island.
The tests in November 1952 resulted in the detonation of the Mike device with a yield of 10.4 megatons, followed by a second detonation less than three weeks later. These events marked the beginning of the thermonuclear era and permanently changed military thinking about deterrence.
The nuclear tests influenced military strategies and scientific research while raising concerns about environmental effects on Pacific island communities.
The atoll lies far from inhabited areas and is not accessible to the public due to ongoing radiation monitoring. Information about the tests is available through archives and documentary records.
The first test erased Elugelab completely, leaving a crater 1.9 kilometers wide and 50 meters deep in the coral reef. The vaporized material created a cloud that rose into the stratosphere, influencing climate research and atmospheric studies for decades.
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